[flang] Resolve misparse of structure constructor as function reference.

Original-commit: flang-compiler/f18@5b6b2540f6c66b3f2900b24b06d732de3436b4ea
Reviewed-on: https://github.com/flang-compiler/f18/pull/322
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#321 from flang-compiler/tsk3

Remove build dependency on clang

Original-commit: flang-compiler/f18@737998bb508819772a4f46f10c7d8d9cfaef9070
Reviewed-on: https://github.com/flang-compiler/f18/pull/321

[flang] Remove build dependency on clang

For now all we need to depend on is LLVM.
Use llvm_map_components_to_libnames to find libraries to link against.

Original-commit: flang-compiler/f18@dff1402c2a781b7fff5c691b45e6a7f2e3a6ef61
Reviewed-on: https://github.com/flang-compiler/f18/pull/321

[flang] Merge pull request flang-compiler/f18#320 from flang-compiler/pmk-expr-rearrangement

Rearrange/simplify expr analysis code

Original-commit: flang-compiler/f18@4eaccde5167370eb082ce6ef0247942a230f94f1
Reviewed-on: https://github.com/flang-compiler/f18/pull/320

[flang] Rearrange/simplify expr analysis code

Original-commit: flang-compiler/f18@aa9f3a7cca821bf8ea430c10fcae49b295ccd489
Reviewed-on: https://github.com/flang-compiler/f18/pull/320

[flang] Merge pull request flang-compiler/f18#317 from flang-compiler/tsk10

Simplify Semantics::Perform

Original-commit: flang-compiler/f18@c435fe65a4c027300365dce9a54240705db1a945
Reviewed-on: https://github.com/flang-compiler/f18/pull/317

[flang] Simplify Semantics::Perform

`Semantics::Perform` is mostly a series of calls followed by a check
for fatal errors. There is more error checking logic than real code.

To make it clearer, change each of the phases it calls to return true
on success so that `Perform` can just call them one after the other.

Original-commit: flang-compiler/f18@a218cac788fdc4018645651964e75221c6f31653
Reviewed-on: https://github.com/flang-compiler/f18/pull/317

[flang] Merge pull request flang-compiler/f18#316 from flang-compiler/pmk-expr-walk

Add Expression traversal framework, use it to reimplement IsConstantE…

Original-commit: flang-compiler/f18@90cd33adcb6c420d0791a094c456832e4d78d548
Reviewed-on: https://github.com/flang-compiler/f18/pull/316

[flang] add descender.h

Original-commit: flang-compiler/f18@cfc3082b7ae840168e891dcf25e0034a4193a3fd
Reviewed-on: https://github.com/flang-compiler/f18/pull/316

[flang] add rewriting as well as const visitation

Original-commit: flang-compiler/f18@1224eaee85c65d70724385d222ba72541dd80213
Reviewed-on: https://github.com/flang-compiler/f18/pull/316
Tree-same-pre-rewrite: false

[flang] More rearrangement

Original-commit: flang-compiler/f18@7a675d9df6ac161d68314459b3a54575eda1d354
Reviewed-on: https://github.com/flang-compiler/f18/pull/316
Tree-same-pre-rewrite: false

[flang] Hide implementation better

Original-commit: flang-compiler/f18@2118b463140f027c81659c647639a03a820437ad
Reviewed-on: https://github.com/flang-compiler/f18/pull/316
Tree-same-pre-rewrite: false

[flang] back out one change

Original-commit: flang-compiler/f18@27fb43b6ed1a4874c153ffc1219dcbdca931804e
Reviewed-on: https://github.com/flang-compiler/f18/pull/316
Tree-same-pre-rewrite: false

[flang] Address review comments

Original-commit: flang-compiler/f18@3ed6199fedc2ba0d527cc7dd46c5ab67a7f0f1c7
Reviewed-on: https://github.com/flang-compiler/f18/pull/316
Tree-same-pre-rewrite: false

[flang] Improve detection of default Handle() callback

Original-commit: flang-compiler/f18@c09c4c9e00d15a5dd391216662665d48a908c4fd
Reviewed-on: https://github.com/flang-compiler/f18/pull/316
Tree-same-pre-rewrite: false

[flang] some tweaks

Original-commit: flang-compiler/f18@07d196386e139b65fe18d4df32f06f994627aac3
Reviewed-on: https://github.com/flang-compiler/f18/pull/316
Tree-same-pre-rewrite: false

[flang] Add Expression traversal framework, use it to reimplement IsConstantExpr()

Original-commit: flang-compiler/f18@f5d39159354a994cdeb5ab1d4cbfea188c14e681
Reviewed-on: https://github.com/flang-compiler/f18/pull/316
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#315 from flang-compiler/tsk10

Create framework for checking statement semantics

Original-commit: flang-compiler/f18@0fcdb68061b8d008d22e0cc0ff4ccdbb40ab8f44
Reviewed-on: https://github.com/flang-compiler/f18/pull/315

[flang] Move ExprChecker into separate pass

DoConcurrentChecker depends on expressions being fully resolved so it
can't be in the same pass as ExprChecker. The same will probably
apply to AssignmentChecker when its finished.

Checks that don't depend on expressions can go in the first pass
with ExprChecker.

Original-commit: flang-compiler/f18@c0785ec06f58098d262cf2f791a98e74bdcef11b
Reviewed-on: https://github.com/flang-compiler/f18/pull/315

[flang] Add test for AssignmentChecker

Add a test to verify that AssignmentChecker is actually running.

Original-commit: flang-compiler/f18@2c91604e9bff06eb8d63d79abda916802966602f
Reviewed-on: https://github.com/flang-compiler/f18/pull/315
Tree-same-pre-rewrite: false

[flang] Create framework for checking statement semantics

Add `SemanticsVisitor` as the visitor class to perform statement
semantics checks. Its template parameters are "checker" classes
that perform the checks. They have `Enter` and `Leave` functions
that are called for the corresponding parse tree nodes (`Enter`
before the children, `Leave` after). Unlike `Pre` and `Post` in
visitors they cannot prevent the parse tree walker from visiting
child nodes.

Existing checks have been incorporated into this framework:
- `ExprChecker` replaces `AnalyzeExpressions()`
- `AssignmentChecker` replaces `AnalyzeAssignments()`
- `DoConcurrentChecker` replaces `CheckDoConcurrentConstraints()`

Adding a new checker requires:
- defining the checker class:
  - with BaseChecker as virtual base class
  - constructible from `SemanticsContext`
  - with Enter/Leave functions for nodes of interest
- add the checker class to the template parameters of `StatementSemantics`

Because these checkers and also `ResolveNamesVisitor` require tracking
the current statement source location, that has been moved into
`SemanticsContext`. `ResolveNamesVisitor` and `SemanticsVisitor`
update the location when `Statement` nodes are encountered, making it
available for error messages.

`AnalyzeKindSelector()` now has access to the current statement through
the context and so no longer needs to have it passed in.

Test `assign01.f90` was added to verify that `AssignmentChecker` is
actually doing something.

Original-commit: flang-compiler/f18@3a222c36731029fabf026e5301dc60f0587595be
Reviewed-on: https://github.com/flang-compiler/f18/pull/315
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#311 from flang-compiler/pmk-struct-checks

More structure constructor semantics checking

Original-commit: flang-compiler/f18@5561c9012c07c21cd043b0b0b8b2a03d6e42bebe
Reviewed-on: https://github.com/flang-compiler/f18/pull/311

[flang] Tweak API per review

Original-commit: flang-compiler/f18@c0ab787cd1eb82a13fca9a473973b25e737da77a
Reviewed-on: https://github.com/flang-compiler/f18/pull/311

[flang] Use value()/has_value() on Indirection class templates instead of operator*/operator->

Original-commit: flang-compiler/f18@a97f377ae6051d877df82036983cc6209a2e0d95
Reviewed-on: https://github.com/flang-compiler/f18/pull/311
Tree-same-pre-rewrite: false

[flang] Dodge bogus G++ 8.1.0 build warning

Original-commit: flang-compiler/f18@582c6d1eca5bc29fddadae4d25e418da4ace2c11
Reviewed-on: https://github.com/flang-compiler/f18/pull/311
Tree-same-pre-rewrite: false

[flang] Improve error messages

Original-commit: flang-compiler/f18@40461345124b95de1f35828885e95d8bf0a235f1
Reviewed-on: https://github.com/flang-compiler/f18/pull/311
Tree-same-pre-rewrite: false

[flang] Add lib/semantics/tools.{h,cc}

Original-commit: flang-compiler/f18@c9823da20746313005ee017413f8207a720a10b0
Reviewed-on: https://github.com/flang-compiler/f18/pull/311
Tree-same-pre-rewrite: false

[flang] C1594 constraint checking on pointer components in struct constructors

Original-commit: flang-compiler/f18@386cd8a9b43f4e65c3e42febbae991fa87d277a9
Reviewed-on: https://github.com/flang-compiler/f18/pull/311
Tree-same-pre-rewrite: false

[flang] Length conversions in array constructors, and fix their formatting

Original-commit: flang-compiler/f18@88cdb49f4892a20f2628f11373a0f1c9c32a6c1e
Reviewed-on: https://github.com/flang-compiler/f18/pull/311
Tree-same-pre-rewrite: false

[flang] Character length conversion on structure constructor component assignments

Original-commit: flang-compiler/f18@051c1dd923a3b321d1a19768414caf93732a3426
Reviewed-on: https://github.com/flang-compiler/f18/pull/311
Tree-same-pre-rewrite: false

[flang] Add SetLength operator to make character length changes explicit

Original-commit: flang-compiler/f18@f2d751d8a6c1bf31f69031bbdab0a823999ebf5c
Reviewed-on: https://github.com/flang-compiler/f18/pull/311
Tree-same-pre-rewrite: false

[flang] snapshot of work in progress

Original-commit: flang-compiler/f18@56e83d4dd64dd7d30b2ce4bbf124f2c39bc14b58
Reviewed-on: https://github.com/flang-compiler/f18/pull/311
Tree-same-pre-rewrite: false

[flang] Represent NULL()

Original-commit: flang-compiler/f18@2c3368fb5f6178bb997936bb506deecc2d8b7d03
Reviewed-on: https://github.com/flang-compiler/f18/pull/311
Tree-same-pre-rewrite: false

[flang] Type checking on values in structure components

Original-commit: flang-compiler/f18@bea98aeb9638b9d584488ae5faf72d53f1747a5f
Reviewed-on: https://github.com/flang-compiler/f18/pull/311
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#314 from flang-compiler/pmk-indirection

Add `ForwardReference<>` class template

Original-commit: flang-compiler/f18@b541a4d167530138025b8a0c8dd1031144ab8435
Reviewed-on: https://github.com/flang-compiler/f18/pull/314

[flang] Add ForwardReference<> + documentation + clean-up

Original-commit: flang-compiler/f18@09e9501951499625fdabdc04f3bcf7ae85b37467
Reviewed-on: https://github.com/flang-compiler/f18/pull/314

[flang] checkpoint

Original-commit: flang-compiler/f18@65abebd838ef6b20960f69595709db55f3e5a9b7
Reviewed-on: https://github.com/flang-compiler/f18/pull/314
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#313 from flang-compiler/pmk-fix312

Fix flang-compiler/f18#312

Original-commit: flang-compiler/f18@74a9426adf29b21a0971f6db224efbd77da989af
Reviewed-on: https://github.com/flang-compiler/f18/pull/313

[flang] Fix a typo in documentation

Original-commit: flang-compiler/f18@3248ec1cf93a18a7172eaeb90688de9fae4ab753
Reviewed-on: https://github.com/flang-compiler/f18/pull/313

[flang] Fix accidentally modified comment

Original-commit: flang-compiler/f18@7d0b365a6dcd02df245ee6ea2fcbadbdb31e86f6
Reviewed-on: https://github.com/flang-compiler/f18/pull/313
Tree-same-pre-rewrite: false

[flang] check out with all versions

Original-commit: flang-compiler/f18@0b1369ce5511d728c10c1b00ca14a2c9c4572ac7
Reviewed-on: https://github.com/flang-compiler/f18/pull/313
Tree-same-pre-rewrite: false

[flang] Fix flang-compiler/f18#312

Original-commit: flang-compiler/f18@625ffb4f1a09343725907fe51597e88e28a0ca91
Reviewed-on: https://github.com/flang-compiler/f18/pull/313
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#310 from flang-compiler/psteinfeld

Fixed reference to a header file

Original-commit: flang-compiler/f18@658bc758d7c4bcea7ffbf06968a2faa3f4c8a124
Reviewed-on: https://github.com/flang-compiler/f18/pull/310

[flang] Fixed reference to a header file

Original-commit: flang-compiler/f18@22f93f0b307384ebe022aa300771fef40039c11e
Reviewed-on: https://github.com/flang-compiler/f18/pull/310

[flang] Merge pull request flang-compiler/f18#308 from flang-compiler/pmk-cleanups

Rename to Fortran.h, update style guide, run clang-format on everything

Original-commit: flang-compiler/f18@0cf07c3ace6b713f8ec0fb348af99a4ef04dd9e3
Reviewed-on: https://github.com/flang-compiler/f18/pull/308

[flang] Missed a fortran.h instance

Original-commit: flang-compiler/f18@3a9a185383fb4bf967624258f59e2f22cd143ed5
Reviewed-on: https://github.com/flang-compiler/f18/pull/308

[flang] Rename to Fortran.h, update style guide, run clang-format

Original-commit: flang-compiler/f18@aa2907d2260c34085360917e7fab43d8ee79b6e4
Reviewed-on: https://github.com/flang-compiler/f18/pull/308
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#309 from flang-compiler/tsk2c

Fix bug in test_modfile.sh

Original-commit: flang-compiler/f18@6e95724f0e2efda36c0efc16d7f6bfde90975a00
Reviewed-on: https://github.com/flang-compiler/f18/pull/309

[flang] Fix bug in test_modfile.sh

The expected mod files specified in the test do not necessarily
appear in sorted order, and the desired order depends on what the
`comm` command expects. So sort them to be sure it is right.

Original-commit: flang-compiler/f18@730d0d0562dd0a4eabfde020fef9fe371d401ff5
Reviewed-on: https://github.com/flang-compiler/f18/pull/309

[flang] Merge pull request flang-compiler/f18#305 from flang-compiler/tsk2

Various name resolution bug fixes

Original-commit: flang-compiler/f18@fc831f600e5d37f646d4a83fbec7befc4d5dffda
Reviewed-on: https://github.com/flang-compiler/f18/pull/305

[flang] Fix bug handling function prefix type

This showed up in procinterface01. A function can have more than one
PrefixSpec (e.g. `real elemental f()`). We need to ignore that ones
that aren't types.

Also, process the type after the ImplicitPart rather than after the
SpecificationPart. The type of the function result variable could
be accessed between those places.

Original-commit: flang-compiler/f18@df85eedb925b6f8739d6f6ccd9820ff5d9e4f4c5
Reviewed-on: https://github.com/flang-compiler/f18/pull/305

[flang] Fix bug with host-association in module procedure interface body

A module procedure interface body can access entities in its host
without an IMPORT statement. So the `ImportKind` of the scope created
for such an interface body should be `Default`, not `None` as it is
for other interface bodies.

Original-commit: flang-compiler/f18@24bb2668fdb626a4df76719345b02e533d015d79
Reviewed-on: https://github.com/flang-compiler/f18/pull/305
Tree-same-pre-rewrite: false

[flang] Allow module procedure and generic with same name

The `GenericDetails::CheckSpecific()` check was happening too early.
We have to wait until all procedures of the generic have been seen.
The generic can have the same name as a module procedure only if that
module procedure is a specific procedure of the generic.

Improve the `SayAlreadyDeclared` error message when the previous
declaration is a use-association

Original-commit: flang-compiler/f18@269e3db6020a5acc51a291dfea98455e6a97d2d5
Reviewed-on: https://github.com/flang-compiler/f18/pull/305
Tree-same-pre-rewrite: false

[flang] Fix .mod file for symbols with same name as generic

When a generic has the same name as a module procedure or derived type,
the latter weren't being written to the `.mod` file. Fix that by calling
`PutSymbol()` on those symbols from the generic. Change `PutSymbol()` to
accept `Symbol *` to make that more convenient.

Original-commit: flang-compiler/f18@1778efe981812b1d1d1b684647c72085f44c3209
Reviewed-on: https://github.com/flang-compiler/f18/pull/305
Tree-same-pre-rewrite: false

[flang] Fix resolution of function prefix type

When a function-stmt has a type in the prefix (`type(t) function f()`),
the type cannot be resolve until after processing the USE and IMPLICIT
statements. So save the parse-tree of the type and process it at the
end of the specification section.

Add `ProcessTypeSpec()` to handle the process of setting up to walk
a type spec, walking it, restoring the state, and returning the type
spec. We do this several other places too.

Original-commit: flang-compiler/f18@bcde294d0e62c6ef8506392f66816814ae976dff
Reviewed-on: https://github.com/flang-compiler/f18/pull/305
Tree-same-pre-rewrite: false

[flang] Fix bug determining type of statement entity

A statement entity (`data-i-do-variable` or `ac-do-variable`) that
doesn't have a type specified gets the type it would have in the
enclosing scope. That means if there is a visible variable with the
same name, the statement entity gets its type. We were failing to
do that and just applying the implicit rules.

Original-commit: flang-compiler/f18@72bc7c29ba8d4be6a7c93080bb7fac7a3bc73577
Reviewed-on: https://github.com/flang-compiler/f18/pull/305
Tree-same-pre-rewrite: false

[flang] Handle subprogram declaration after call

If an external subprogram is called and then declared, we have to
replace the `ProcEntityDetails` with `SubprogramDetails` in the symbol.
While doing so we can also check that the call was consistent with the
declaration for function vs. subprogram.

Original-commit: flang-compiler/f18@e43a2dae790cd0f54ecaec2ffc1235fd2b7754e9
Reviewed-on: https://github.com/flang-compiler/f18/pull/305
Tree-same-pre-rewrite: false

[flang] Fix bug determining function vs. subroutine

We were setting `expectedProcFlag_` to indicate if a `ProcedureDesignator`
was used in a function or subroutine context. That didn't work if they
were nested, for example: `call f(g())`.

Instead, at the point we know function vs. subroutine (i.e. in the
`CallStmt` and `FunctionReference` nodes), explicitly walk the children,
passing in the flag.

Original-commit: flang-compiler/f18@8a13283f98c366b74b35bc003f7bc908212a0c6c
Reviewed-on: https://github.com/flang-compiler/f18/pull/305
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#307 from flang-compiler/pmk-fixes

fix flang-compiler/f18#303, better error recovery for misplaced type parameter declarat…

Original-commit: flang-compiler/f18@79684ed2ebd3d1a3670fad87de69f104305116cc
Reviewed-on: https://github.com/flang-compiler/f18/pull/307

[flang] fix flang-compiler/f18#303, better error recovery for misplaced type parameter declarations

Original-commit: flang-compiler/f18@ebaa23cbcd91ba83b65b8dd174baffab1395bc65
Reviewed-on: https://github.com/flang-compiler/f18/pull/307

[flang] Merge pull request flang-compiler/f18#306 from flang-compiler/pmk-documentation

Small edits to C++17 usage notes

Original-commit: flang-compiler/f18@0e51862dd2646ee763d8f31628ba61f0621072ea
Reviewed-on: https://github.com/flang-compiler/f18/pull/306

[flang] Small edits to C++17 usage notes

Original-commit: flang-compiler/f18@bdf62ac90020c84516400085b75109979d599dd7
Reviewed-on: https://github.com/flang-compiler/f18/pull/306

[flang] Merge pull request flang-compiler/f18#294 from flang-compiler/ir2

Fortran IR: part 2, lowest layer of the IR hierarchy. Specifically, Basic Blocks

Original-commit: flang-compiler/f18@5bae9491740cf402218233fd1bc69ee9c92d8a8b
Reviewed-on: https://github.com/flang-compiler/f18/pull/294

[flang] address review comments

Original-commit: flang-compiler/f18@b1c731b0266576d103f2dc44dfdb3410795cd81d
Reviewed-on: https://github.com/flang-compiler/f18/pull/294

[flang] respond to review comments - part 2

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[flang] Fortran IR: lowest layer of the IR hierarchy. Specifically, Basic Blocks
contain Statements.  This layer is still evolving as the IR takes better
shape and other code in the compiler is written.

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[flang] Merge pull request flang-compiler/f18#293 from flang-compiler/ir1

Fortran IR: part 1. staged pull request for the "upper layers" of the IR.  The

Original-commit: flang-compiler/f18@f978be5b8ed77bd3ce62ca1b5c99d3bd42863b82
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[flang] code review comments

Original-commit: flang-compiler/f18@ef9bfa4bd7bed6a5cb3a78ae7abc9fb428f8d7e2
Reviewed-on: https://github.com/flang-compiler/f18/pull/293

[flang] Address review comments on part 1

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[flang] Fortran IR: staged pull request for the "upper layers" of the IR.  The
Fortran IR is hierarchical: A Program contains Procedures.  Procedures
contain Basic Blocks. Groups of Basic Blocks can be grouped as Regions.
This structure follows those one finds in SIL and LLVM IR, etc.

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[flang] Merge pull request flang-compiler/f18#297 from flang-compiler/ir5

Fotran IR: part 5. Afforestation is the lowering of concrete parse trees

Original-commit: flang-compiler/f18@20da0d93e9c8d18ee44b4dfa4dff43c96576df45
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[flang] changes per review comments

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[flang] address code review for part 5

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[flang] Fotran IR: part 5. Afforestation is the lowering of concrete parse trees
and semantics information into the Fortran IR.

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[flang] Merge pull request flang-compiler/f18#296 from flang-compiler/ir4

Fortran IR: part 4. Dotty graph visualization and other miscellaneous

Original-commit: flang-compiler/f18@6277e67c2770f26e288707bbaddf17aa022872b4
Reviewed-on: https://github.com/flang-compiler/f18/pull/296

[flang] address review comments

Original-commit: flang-compiler/f18@d1a213ae5522f4ee3967dd53dc1ef90805062237
Reviewed-on: https://github.com/flang-compiler/f18/pull/296

[flang] address review comments from part 4

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[flang] Fortran IR: part 4. Dotty graph visualization and other miscellaneous
headers.

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[flang] Merge pull request flang-compiler/f18#295 from flang-compiler/ir3

Fortran IR: part 3, the FIR builder.  This is a factory class for

Original-commit: flang-compiler/f18@3e0cb83f037a6f2ded88e99d0e82722d68d49b37
Reviewed-on: https://github.com/flang-compiler/f18/pull/295

[flang] address review comments

Original-commit: flang-compiler/f18@4dd4766f4d52319b6da47288134dd1b80aa425eb
Reviewed-on: https://github.com/flang-compiler/f18/pull/295

[flang] respond to review comments for part 3

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[flang] Fortran IR: part 3, the FIR builder.  This is a factory class for
helping to build a FIR representation.

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[flang] Merge pull request flang-compiler/f18#304 from flang-compiler/pmk-proc-interface

Procedure(id) semantics

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Reviewed-on: https://github.com/flang-compiler/f18/pull/304

[flang] unparse interfaces as PROCEDURE(TYPE(REAL)) to avoid ambiguity

Original-commit: flang-compiler/f18@efef1f1ad13acc65b37e73efa25b9402ab6c0bb5
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[flang] address review comments

Original-commit: flang-compiler/f18@6f4af0fc1b0179808f8d4583de300564ef7f64c4
Reviewed-on: https://github.com/flang-compiler/f18/pull/304
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[flang] prep for review

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[flang] rebasing

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[flang] Clean up DynamicType, link it to symbol table character length

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Reviewed-on: https://github.com/flang-compiler/f18/pull/304
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[flang] checkpoint

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[flang] checkpoint

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[flang] checkpoint

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[flang] Merge pull request flang-compiler/f18#301 from flang-compiler/psteinfeld

Cleanup of the documentation directory

Original-commit: flang-compiler/f18@d9cd68e0783ba81c9d7f4441a61a0b8cb442bb1d
Reviewed-on: https://github.com/flang-compiler/f18/pull/301

[flang] Update ControlFlowGraph.md

Original-commit: flang-compiler/f18@50ce01185f708c3d80fd87579d28adc72dcf1555
Reviewed-on: https://github.com/flang-compiler/f18/pull/301

[flang] Update C++style.md

Original-commit: flang-compiler/f18@85215c871b6d728e7b97e393ff26b577c6cec2e7
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[flang] Update Overview.md

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[flang] Rename Mod-files.md to ModFiles.md

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[flang] Update and rename Fortran-ir.md to FortranIR.md

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[flang] Update README.md

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[flang] Rename semantics.md to Semantics.md

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Reviewed-on: https://github.com/flang-compiler/f18/pull/301
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[flang] Rename preprocessing.md to Preprocessing.md

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Reviewed-on: https://github.com/flang-compiler/f18/pull/301
Tree-same-pre-rewrite: false